base: Remove the string logging from CHECK().

components/sync/engine_impl/loopback_server/persistent_tombstone_entity.cc

Index: components/sync/engine_impl/loopback_server/persistent_tombstone_entity.cc
diff --git a/components/sync/engine_impl/loopback_server/persistent_tombstone_entity.cc b/components/sync/engine_impl/loopback_server/persistent_tombstone_entity.cc
index 0d5b88deeef451aaa54fccb041768796d517d192..f52600366fa3d1ced8a3263303a1d0ee64f818ac 100644
--- a/components/sync/engine_impl/loopback_server/persistent_tombstone_entity.cc
+++ b/components/sync/engine_impl/loopback_server/persistent_tombstone_entity.cc
@@ -23,8 +23,8 @@ PersistentTombstoneEntity::~PersistentTombstoneEntity() {}
 std::unique_ptr<LoopbackServerEntity> PersistentTombstoneEntity::Create(
     const sync_pb::SyncEntity& entity) {
   const ModelType model_type = GetModelTypeFromId(entity.id_string());
-  CHECK_NE(model_type, syncer::UNSPECIFIED) << "Invalid ID was given: "
-                                            << entity.id_string();
+  // Invalid ID was given.
+  CHECK_NE(model_type, syncer::UNSPECIFIED);
   return std::unique_ptr<LoopbackServerEntity>(new PersistentTombstoneEntity(
       entity.id_string(), entity.version(), model_type));
 }